How to choose tunner？

Questions
#1

create tuner

    if tuner == 'xgb' or tuner == 'xgb-rank':
        tuner_obj = XGBTuner(tsk, loss_type='rank')
    elif tuner == 'ga':
        tuner_obj = GATuner(tsk, pop_size=100)
    elif tuner == 'random':
        tuner_obj = RandomTuner(tsk)
    elif tuner == 'gridsearch':
        tuner_obj = GridSearchTuner(tsk)
    else:
        raise ValueError("Invalid tuner: " + tuner)
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